A linear ODE

Find the $\textbf{general}$ solution of

$y'= \left (\begin{matrix} 1 & 1 & 1 \\ -1 & 0 & 1 \\ 1 & 1 & 0 \end{matrix} \right ) \cdot y$ 

and a solution with the initial value   $y(0) = \left ( \begin{matrix} 1 \\  -1 \\ 1 \end{matrix} \right )$.

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